I have been checking at blender's, apricot's and CS' web site and I'm a little bit confused

On Blender e-shop it says about Yo Frankie:

Quote

On the Yo Frankie! DVD you will find:- A full functional game in the Blender Game Engine, running in Linux, Windows and OS X.- A complete level in Crystal Space, with installer, running in Linux, Windows and OS X.

Does it mean that in fact the game uses the Blender game engine and not crystal space? I would really apreciate if somebody could clarify me which role Crystal space plays in the game.

The one with BGE is a full game and is playable. It is also a bit faster.The one with CS is not that playable and lacks a lot of features but (if you have the right hardware) it looks a lot better. However it is slower (due to it being better looking).